Abstract
To evaluate the occlusion of arteries, 6 conic intravascular endoprosthetic stents of titanium—nickle—alloy were implanted transluminally to right external iliac arteries in 2 normal dogs and 4 normal pigs. The stent was characterised by ductility below 313 K and restoration memory—shape between 313—319 K. The diameter of large end of conic stent was 4.0 mm in dog and 4.5 mm in pig. The topographic anatomy showed that the external iliac artery was near complete occlusion, with a very small lumen (about 1 mm in diameter) residualized in dogs in 6 months, while complete occlusion in pigs in 8 months. The histopathological examination indicated that the arterial intima of upper breach from stented site was smooth, and that neither inflammatory cells infiltration nor foreign giant cell reaction was found. The new—formed granulation tissue inside stent came from emboli organization. These results suggest that shape—memory alloy stent has good biocompatibility and conic intravascular endoprosthetic stent might completely occlude the arterial blood flow.
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